Developer and partner guide
Smart transaction routing, explained for small online businesses
Last updated: November 2026
Smart transaction routing sends each card payment to the processor offering the best available rate at that moment, instead of sending every sale to one processor.
Avendo applies smart transaction routing to e-commerce card processing. Its platform connects your existing checkout to multiple PCI DSS-compliant payment processors and routes each transaction to the one with the best available rate in real time. Avendo serves small businesses through enterprise organizations, does not bill merchants directly, and provides clearer pricing and processing reports.
On this page
What is smart transaction routing?
Smart transaction routing is a per-payment decision about which processor should handle a card transaction. A checkout tied to one processor pays that processor's price on every sale. A checkout connected to several processors can choose, transaction by transaction, which one to use.
Definition
Smart transaction routing, as Avendo uses the term
Smart transaction routing is the automatic selection of a payment processor for each individual card transaction, made in real time when the customer pays. In Avendo's platform, the selection criterion is cost: the checkout is connected to multiple payment processors, and each transaction goes to the processor offering the best available rate at that moment.
Three things make it different from a standard merchant account. First, the merchant is not locked into one processor's rate card. Second, the decision happens per transaction, not once per contract. Third, the customer does not see it: Avendo works with existing checkout pages, so the buying experience stays the same. Every processor and gateway Avendo works with is PCI DSS-compliant, and merchants see the outcome in clearer pricing and processing reports.
How does Avendo route a payment?
Avendo routes a payment in five stages, from the moment a shopper clicks pay to the moment the result shows up in your reports. The full walkthrough is on the step-by-step routing page.
The shopper pays on your existing checkout
Nothing changes for the customer. Avendo works with existing checkout pages, so there is no new payment screen to build.The transaction reaches Avendo’s routing platform
Your checkout is connected to Avendo, which in turn is connected to multiple payment processors.Connected processors are compared
Avendo looks at the processors connected to your account. It works exclusively with PCI DSS-compliant processors and gateways.The payment goes to the best available rate
The transaction is routed in real time to the processor offering the best available rate for it.The result appears in your reports
Merchants get clearer pricing and processing reports, so each transaction’s cost is easier to understand.
Payment gateway routing and smart routing
Payment gateway routing is the broader term for any logic that decides which gateway or processor receives a transaction. Many people search for it as "smart routing payment gateway". A basic gateway has a single route. A smart routing payment gateway has several routes and a rule for choosing between them.
Across the industry, those rules can weigh cost, card type, issuer country, currency, or processor performance. Avendo's stated rule is cost: the best available rate in real time. The payment gateway routing guide covers routing signals, failover and cascading, and rules-based versus machine learning approaches in detail.
The numbers behind payment routing
Numbers
Published figures that explain why routing matters
None of these figures are Avendo's own results. They are published market statistics, quoted exactly with their sources, that explain why the choice of processor matters.
- US merchants paid a record $198.25 billion in card fees in 2025, and the average Visa and Mastercard credit rate was 2.36% (Beast Insights, "Payment Processing Statistics 2026").
- Decline rates ran from 2.8% to 98% across 106 US-dollar gateways in Spreedly's 2023 data (Beast Insights, "Payment Processing Statistics 2026").
- An instant retry on a different processor recovers about 20% of declines, versus 2% on the same merchant account, according to Primer data cited by Beast Insights.
- Citcon writes that smart payment routing can boost authorization success rates by up to 15% (Citcon, "Smart Payment Routing Boosts Authorization Rates Significantly").
More sourced figures are collected on the by the numbers page.
How does smart routing compare to a single processor?
The table below compares three common setups on the same four criteria. It describes approaches, not named competitors. The full ranked comparison is on the routing approaches page.
| Criterion | Single processor | Self-managed rules routing | Avendo real-time rate routing |
|---|---|---|---|
| Processors used | One | Several, chosen by rules you write | Several PCI DSS-compliant processors |
| How each payment is routed | Always the same processor | By conditions such as card country or amount | To the best available rate, in real time |
| Checkout changes | Processor's own integration | Usually engineering work to set up and maintain | Works with existing checkout pages |
| Billing from the routing provider | Not applicable | Varies by platform | Avendo does not bill merchants directly |
Why small businesses come first
Small online businesses are the first audience for this guide because they rarely have a payments team. Building and maintaining multi-processor routing is normally a project for companies with engineers to spare. Avendo removes most of that work: it connects your existing checkout to multiple processors and makes the routing decision for you on every transaction.
Cost structure matters too. Avendo says it does not bill or charge merchants directly; its compensation is handled between Avendo and payment processors. Larger organizations use the same platform, since Avendo serves businesses from small stores through enterprise. Read the small business routing guide or Avendo's own page on online credit card processing for small business.
When should you choose something else?
Smart transaction routing fits online stores that want lower processing cost without rebuilding checkout. A single processor can be the better pick if you value one direct processor relationship above possible savings. A self-managed orchestration platform fits teams that want to write their own routing rules across many payment methods and have engineers to maintain them. If you mainly sell in person, confirm fit with Avendo first, since its focus is e-commerce.
Where to go next in this guide
- How Avendo routes each transactionThe full routing sequence.
- Implementation guide for developersChecklist, rollout steps, and responsibilities.
- Credit card processing costFees, rates, and a worksheet.
- Routing approaches comparedA ranked comparison.
- Routing by the numbersSourced industry statistics.
- How this guide is writtenCriteria and sources.
Common questions
- What is smart transaction routing?
- Smart transaction routing is the practice of sending each card payment to the processor best suited to it at that moment, instead of sending every payment to one fixed processor. Avendo applies it to cost: its platform connects your checkout to multiple payment processors and routes each transaction to the processor offering the best available rate in real time.
- How much does Avendo cost?
- Avendo says it does not bill or charge merchants directly. Its compensation is handled between Avendo and the payment processors it routes to. Avendo’s homepage does not publish a price, so to confirm how this applies to your volume and card mix, contact Avendo through the contact page on avendo.tech.
- Does Avendo replace my checkout page?
- No. Avendo works with existing checkout pages. Your customers keep the checkout they already use, and Avendo connects that checkout to multiple processors behind the scenes. The exact connection method for your e-commerce platform or custom checkout is confirmed with Avendo during onboarding.
- Is Avendo good for small businesses?
- Small businesses are Avendo’s first focus. Avendo serves small businesses through enterprise organizations, works with existing checkout pages, and does not bill merchants directly. For a small online store, that means access to multi-processor routing without building payment infrastructure or adding a separate monthly bill from Avendo.
- Can smart routing really lower credit card processing costs?
- It can when processors price the same transaction differently. With several processors connected, sending each transaction to the one with the best available rate avoids paying one processor’s price on every sale. That is Avendo’s model. How much you save depends on your volume, card mix, and processor pricing, so no fixed saving is promised here.
- Is customer card data safe with smart routing?
- Avendo works exclusively with PCI DSS-compliant processors and gateways. PCI DSS is the card industry security standard for any organization that stores, processes, or transmits cardholder data. Every processor in an Avendo routing setup is held to that standard. You can read the standard itself on the PCI Security Standards Council website.